Network for obtaining high power and low total harmonic distortion
December 23, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesD-C Power supply circuit with high power factor Low-ripple power rectifier system Power factor correcting network Operating circuit for a direct current discharge lamp Power factor improving arrangement Method and network for enhancing power factor of off-line switching circuit Power factor correction circuit for power supplies Power factor correction circuit Patent #: 5012161 InventorAssigneeApplicationNo. 812089 filed on 12/23/1991US Classes:363/48, For semiconductor rectifier323/205, FOR REACTIVE POWER CONTROL323/208, Using impedance333/175Resonant, discrete frequency selective typeExaminersPrimary: Voeltz, Emanuel T.Attorney, Agent or FirmForeign Patent References
International ClassH02M 001/12AbstractAn arrangement includes a network for connection between an AC power supply and the input of a DC power supply containing rectifiers and a filter capacitor. The network forms a third order, damped low-pass filter that waveshapes the AC input current so as to either reduce or remove the magnitude of harmonics which primarily cause distortion of the input current waveform. In a preferred embodiment, the waveshaping network includes an inductor connected in series with the input of the DC power supply. A series combination of a damping resistor and a first capacitor is connected in parallel with the series inductor. A second capacitor is connected in shunt with the input terminals of the DC power supply. The waveshaping network increases the power factor and lowers the total harmonic distortion the input of the DC power supply presents to the AC power supply.Other References
Field of SearchWith low pass L or LC filterFor semiconductor rectifier FOR REACTIVE POWER CONTROL Using impedance RC or RL type Resonant, discrete frequency selective type Including specific frequency rejection means Including bandwidth adjusting, shaping, or stabilization means Smoothing type (e.g., direct current power supply filters or decoupling filters) | |
